64 IBM System Storage N series Hardware Guide
6.1.4 Bottom connections
The bottom ports of the SAS shelves are connected to the HA pair controllers, as shown in
Figure 6-5.
Figure 6-5 SAS shelf cable bottom connections
Figure 6-5 is a fully redundant example of SAS shelf connectivity. No single cable failure or
shelf controller causes any interruption of service.
6.1.5 Verifying SAS connections
After you complete the SAS connections in your storage system by using the applicable
cabling procedure, verify the SAS connections. Complete the following steps to verify that the
storage expansion unit IOMs have connectivity to the controllers:
1. Enter the following command at the system console:
sasadmin expander_map
Tip: For Active/Active (high availability) configurations, run this command on both
nodes.
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